body {
    font-family: Arial, sans-serif;
    background-color: #f2f2f2;
}

h1 {
    color: #333;
}

.sidebar {
    width: 200px;
    background-color: #e2f1fb;
    padding: 20px;
    height: 100vh;
    position: fixed;
    left: 0;
    top: 0;
}

.sidebar ul {
    list-style-type: none;
    padding: 0;
}

.sidebar li {
    margin-bottom: 10px;
}

.sidebar a {
    display: block;
    padding: 10px;
    background-color: #d8e9f9;
    text-decoration: none;
    color: #333;
}

.sidebar a:hover {
    background-color: #c3ddf7;
}

.content {
    display: flex;
    /*flex-direction: column;*/
    height: 100vh;
    width: 90%;
    margin-right: 240px;
}

iframe {
    width: calc(100% - 240px); /* 考虑到导航栏和内容区域的宽度 */
    height: calc(100vh - 40px); /* 考虑到内容区域的上下边距 */
    flex: 1;
    border: 0;
    float: right;
}